Mg-modified biochar increases adsorption and retention of nitrogen and phosphorus in greenhouse vegetable soil

文献类型： 外文期刊

第一作者： Wang, Yaling

作者： Wang, Yaling;Wang, He;Peng, Zhengping;Liu, Chunjing;Wang, Yaling;Cheng, Yuyang;Wen, Xinyue;Mei, Xiuwen;Wang, Xiubin;Cheng, Yuyang

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关键词： Mg-modified biochar; Nitrogen/phosphorus; Adsorption; Retention; Greenhouse vegetable soil

期刊名称：ENVIRONMENTAL TECHNOLOGY & INNOVATION （ 影响因子：7.1； 五年影响因子：7.1 ）

ISSN： 2352-1864

年卷期： 2025 年 40 卷

页码：

收录情况： SCI

摘要： High accumulation of nitrogen (N) and phosphorus (P) in greenhouse vegetable soils raises leaching risks. Metal-modified biochar can enhance soil adsorption of either N or P, but its adsorption and retention effects under the addition of dual-solute (N and P) remain unclear. In this study, raw biochar (BC) was prepared by pyrolyzing sheep manure at 550 degrees C under N2 atmosphere, while Mg-modified biochar (Mg-BC) was synthesized by mixing BC with 0.5 mol L- 1 MgCl2. Adsorption isotherms, soil column leaching, and pot experiments were conducted to explore their effects on the adsorption and retention of N and P in greenhouse vegetable soil under co-existing addition of N and P solutes. Results showed that the Mg-BC treatment contained more surface oxygen-containing groups and MgO/Mg(OH)2 crystals. According to the Langmuir model, the maximum adsorption capacities of Mg-BC for NO3- and PO43 - were 1.38 and 1.84 times those of BC, respectively. Soil column leaching experiments showed that the Mg-BC treatment reduced total N and P leaching losses by 30.98 % and 51.25 % compared to BC, effectively inhibiting NO3--N, dissolved inorganic N, and soluble reactive P leaching. Additionally, compared to BC, Mg-BC increased pakchoi biomass by 17.28 % and enhanced soil NO3--N, ammonium N, and available P (AP) by 128.22 %, 44.67 %, and 52.94 %, respectively. Overall, Mg-BC exhibits dual functions in N/P adsorption and nutrient availability enhancement, guiding future research on optimizing modified biochar and promoting sustainable greenhouse vegetable production.

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